Lithium-rich manganese base material lithium ion battery anode and lithium ion battery provided with same

A lithium-ion battery, lithium-rich manganese-based technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of poor cycle performance, obvious volume effect, poor rate performance, etc. resistance, cheap and easy-to-obtain raw materials, and the effect of reducing the internal resistance of the battery

Active Publication Date: 2017-05-31
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of the existing lithium-rich manganese-based lithium-ion batteries in the charging and discharging process, such as obvious volume effect, poor rate performance, and poor cycle performance, and provide a battery with low DC internal resistance. Lithium-ion batteries with high rate performance and long cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The positive active material is 0.5Li 2 MnO 3 0.5LiNi 0.33 co 0.33 mn 0.33 o 2 , the positive electrode conductive agent is a mixture of conductive carbon black, conductive graphite and carbon nanotubes, the positive electrode binder is polyvinylidene fluoride, and the mass percentages of each component are: positive electrode active material 90%, positive electrode conductive agent 6% (wherein conductive Carbon black 2%, conductive graphite 2%, carbon nanotube 2%), and positive electrode binder 4%.

[0022] The positive current collector is an aluminum foil coated with a first conductive coating and a second conductive coating on both sides, and the thickness of the aluminum foil before coating is 20 μm.

[0023] Wherein the first conductive coating is a mixture of graphene and polyvinylidene fluoride, the mass percentage of each component in the coating is: graphene 95%, polyvinylidene fluoride 5%, and the load on one side of the coating is 0.5g / m 2 , the maxi...

Embodiment 2

[0030] The positive active material is 0.3Li 2 MnO 3 0.7LiNi 0.33 co 0.33 mn 0.33 o 2 , the positive electrode conductive agent is a mixture of conductive carbon black, conductive graphite and carbon nanofibers, the positive electrode binder is polyvinylidene fluoride, and the mass percentages of each component are: positive electrode active material 93%, positive electrode conductive agent 3% (wherein conductive Carbon black 1%, conductive graphite 1%, carbon nanofiber 1%), and positive electrode binder 4%.

[0031] The positive current collector is an aluminum foil coated with a first conductive coating and a second conductive coating on both sides, and the thickness of the aluminum foil before coating is 15 μm.

[0032] Wherein the first conductive coating is a mixture of conductive carbon black and polyvinylidene fluoride, the mass percentage of each component in the coating is: conductive carbon black 90%, polyvinylidene fluoride 10%, and the loading on one side of t...

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Abstract

The invention relates to an lithium-rich manganese base material lithium ion battery anode which comprises an anode current collector and an anode material layer coating the anode current collector. The anode material layer comprises an anode active substance which is of a lithium-rich manganese base material, the anode current collector is of a conductive substrate with the surface coated with a first conductive coating and a second conductive coating, the first conductive coating is a mixture of a conductive agent and polyvinylidene fluoride, the conductive agent is one or several of conductive carbon black, conductive graphite, a carbon nano tube, grapheme and carbon fiber, the first conductive coating is coated on the surface of the conductive substrate, the second conductive coating is a mixture of polyaniline and polyvinylidene fluoride, and the second conductive coating is coated on the surface of the first conductive coating. The invention further provides a lithium ion battery provided with the lithium-rich manganese base material lithium ion battery anode. The lithium ion battery has the advantages of low internal direct-current resistance, high rate performance, long cycle life and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery positive electrode of a lithium-rich manganese-based material and a lithium-ion battery containing the positive electrode. Background technique [0002] Lithium-ion batteries are having an increasingly profound impact on people's production and life, and are increasingly widely used in modern society, not only in portable electrical appliances such as mobile phones, notebook computers, and electric tools, but also in the field of electric vehicles. application prospects. People's demand for lithium-ion batteries is also increasing, especially electric vehicles urgently need lithium-ion batteries with high safety, high energy density, high power, large capacity, long life, and low cost. [0003] In recent years, lithium-rich manganese-based cathode materials xLi 2 MnO 3 ·(1-x)LiMO 2 (Where M is one or more of Co, Mn, Ni, Cr, Fe, Al, and 0<x<1) D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62H01M4/64H01M10/0525
CPCH01M4/505H01M4/622H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 邵泽超武兆辉王建涛李先季高敏庞静卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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